package com.itheima.stringbuilder;

public class StringBuilderTest {
    /*
    实现字符串的拼接,达到[1, 2, 3]的效果
     */
    public static void main(String[] args) {
        int[] arr = {1,2,3};
        String s = toString(arr);
        System.out.println(s);
    }
    public static String toString(int[] arr){
        StringBuilder sb = new StringBuilder("[");
        for (int i = 0; i < arr.length; i++) {
            if(i == arr.length-1){
                sb.append(arr[i]+"]");
            }else{
                sb.append(arr[i]+", ");
            }
        }
        return sb.toString();
    }
}
